裂缝性碳酸盐岩储层应力敏感性实验研究  

Experimental Study on the Stress Sensitivity of Fractured Carbonate Reservoirs

作　　者：杨枝[1] 孙金声 张洁 张希文 刘大伟 王成彪[1] 

机构地区：[1]中国地质大学(北京) [2]中国石油集团钻井工程技术研究院 [3]渤海钻探工程技术研究院

出　　处：《钻井液与完井液》2009年第6期5-6,9,共3页Drilling Fluid & Completion Fluid

基　　金：国家科技重大专项<大型油气田及煤层气开发>项目21-深井钻录;测试技术和配套装备中专题2"碳酸盐岩;火成岩及酸性气藏高效安全钻完井技术"(2008ZX05021)

摘　　要：使用基质渗透率较低的天然致密碳酸盐岩制备裂缝性岩心,采用传统砂岩储层应力敏感性评价与应力敏感修正系数相结合的方法,研究了裂缝性碳酸盐岩岩样的应力敏感程度、在不同有效应力条件下渗透率和逆向渗透率恢复的变化规律,分析了裂缝性储层应力敏感性机理及影响因素。结果表明,经人工造缝后的碳酸盐岩储层岩样具有较强的应力敏感性,且存在着显著的裂缝滞后效应,渗透率发生了永久性伤害,应力敏感损害严重。因此,有必要选用能快速在井壁上形成致密封堵层的钻井液,并增强岩石强度,稳定井壁,提高地层承压能力,减少储层应力敏感损害。The effect of effective stress on the permeability of fractured carbonate rock sample was studied on low permeability natural carbonate rock samples.It is shown that,the permeability of carbonate rock sample with artificial fractures is sensitive to stress changes,and a remarkable fracture-lag effect can be observed.The permeability of the sample is permanently damaged,showing that stress change causes a severe damage to the permeability of the sample.It is thus concluded that a drilling fluid capable of forming a tough sealing film should be used in drilling this kind of formation,and measures should be taken to strengthen the formation rocks,in an effort to minimize the damage caused by stress changes.

关 键 词：裂缝性 碳酸盐岩 防止储层损害 应力敏感 评价方法 

分 类 号：TE258[石油与天然气工程—油气井工程]